Difference between import {module} and import module

Question

I have seen the following two variations for importing code from another module in ES6:

import {module}  from "./Module"

and

import module from "./Module"

where module is a ES6 class defined in the file

Module.js

What is the difference between the two import statements?

Answer 1

The difference is the way it is exported.

export default const myModule = {}

Basically it says "this is the default export". You import this with

import myModule from 'module'

The other way is that multiple entry points can be exported like this:

export const myModule1 = {}
export const myModule2 = {}

You import these with

import {myModule1, myModule2} from 'module'

and if both a default and named entry points are exported you can do this:

import myModule, {myModule1, myModule2} from 'module'

It does not seem completely logical, usually the package author should explain how their module should be imported. If you are the author, this will help you

Answer 2

In the first case

import {module}  from "./Module"

you are importing single export from a module and inserts 'module' in the current scope. In Module.js file you have to have named exports:

export { module, module2 }; 

Please notice there are two named exports, but you are importing only one.

In second example you are importing default export:

import module from "./Module"

and in your Module.js file export can look like this:

export default module3;

Notice that you can import your default under different name.